It has a moving effect on Parisians and Muscovites (5)

I believe the answer is:

metro

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'it has a moving effect on parisians and muscovites' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for metro that I've seen before include "The Paris Underground transport system" , "Paris subway" , "Urban railway system" , "Parisian rail system" , "The underground railway system in Paris" .)

I've seen this clue in the Evening Standard.

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